Mathematics MCQs

Page No. 75

wo pipes X and Y fill a tank in 15 hrs. and 20 hrs. respectively, while a third pipe ‘Z’ can empty the full tank in 25 hrs. All the three pipes are opened in the beginning. After 10 hrs. Z is closed. In how much time, will the tank be full ?


a12 hrs


b14 hrs


c16 hrs


d18 hrs


View Answer 12 hrs

P can lay railway track between two stations in 16 days. Q can do the same job in 12 days. With the help of R, they completes the job in 4 days. How much days does it take for R alone to complete the work?


a9(3/5) days


b9(1/5) days


c9(2/5) days


d10 days


View Answer 9(3/5) days

P can finish a work in 18 days. Q can finish the same work in 15 days. Q worked for 10 days and left the job. how many days does P alone need to finish the remaining work?


a8


b6


c4


d2


View Answer 6

P and Q can complete a work in 20 days and 12 days respectively. P alone started the work and Q joined him after 4 days till the completion of the work. How long did the work last?


a5 days


b10 days


c15 days


d12 days


View Answer 10 days

P,Q and R together earn Rs.1620 in 9 days. P and R can earn Rs.600 in 5 days. Q and R in 7 days can earn Rs.910. How much amount does R can earn per day?


aRs.40


bRs.70


cRs.90


dRs.100


View Answer Rs.70

C takes 6 days to complete half of a work and D takes 5 days to complete 1/3rd of the same work. They take turns to complete the task. If C works for the first 4 days, in how many days will D complete the rest of the work without the help of C?


a10 days


b12 days


c8 days


d9 days


View Answer 10 days

If 28 men can finish a work in 15 days, 21 men can finish the same work in___________?


a24 days


b14 days


c15 days


d20 days


View Answer 20 days

15 men can build a 500m long wall in 30 days. In how many days can 30 men build a 1.2 km long wall?


a48 days


b24 days


c40 days


d36 days


View Answer 36 days

8 children and 12 men complete a certain piece of work in 9 days. If each child takes twice the time taken by a man to finish the work, in how many days will 12 men finish the same work ?


a6 days


b8 days


c10 days


d12 days


View Answer 12 days

A is thrice as good a work man as B and takes 10 days less to do a piece of work than B takes. B can do the work in:___________?


a15 days


b14 days


c16 days


d30 days


View Answer 15 days

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